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What Is the Normal Range of the Clock DA Value of OptiX OSN Equipment

Publication Date:  2012-07-25 Views:  122 Downloads:  0

Issue Description

Is the clock DA value of NG-SDH equipment in the same range of from 06FF to 08 FF as the Metro equipment? If the clock DA value exceeds the range, how to handle the problem? 

Alarm Information

Null or SYN-BAD 

Handling Process

From the preceding analysis, it can be seen that the clock DA value rage of the NG-SDH equipment is much wider than the clock DA value range (from 1791 to 2303) of the Metro equipment. Hence, when the clock DA value of the equipment in the network slightly exceeds the range 0688--08FF, no alarm is reported. If the service is not affected, the problem needs not to be handled.
The DA value of much NG-SDH equipment in the network still ranges from 06FF to 08FF. If the DA value slightly exceeds the range, the problem can be neglected. 

Root Cause

For the NG-SDH equipment, when the DA value ranges from 100 to F00 (hexadecimal), the SYN-BAD alarm is often not reported. The range in decimal is from 255 to 3840. When the DA value is out of this range, the SYN-BAD alarm is reported. In this case, the problem must be handled in time. 


If the patrolling tool of the latest version detects that the DA value of the OptiX OSN equipment falls out of the range 06FF--8FF for continuously 15 times, the tool prompts the user to handle the problem. In this case, the user needs to query and determine whether the current DA value is just slightly out of the range. If the DA value is not very large and is very close to the margin that leads to the report of the SYN-BAD alarm, the problem can be neglected.